Problem
UCS as virtual machine stalls several times a day
Environment
UCS running as virtual machine on a KVM hypervisor.
As storage a Ceph Cluster is used.
The UCS vm has a lot of assigned storage devices.
Solution
Increase the maximum allowed value for open files on the KVM system. Check limits.conf for the value of “nofile” and increase the value according to your needs (ie use 65,535).